A Rational Theory of Tire-Pavement Friction

Table 8

Calculation of the sliding friction index (SFI) using data from TRB locked-wheel testing.

value	value	value	Difference	Division BY	SFI
800 lb	350 lbf	150 lbf	200 lbf	200 lb/800 lb	0.25
1000 lb	400 lbf	150 lbf	250 lbf	250 lb/1000 lb	0.25
1200 lb	450 lbf	150 lbf	300 lbf	300 lb/1200 lb	0.25